Device for balancing drums, &amp;c.



H. J. GEHR. DEvlcF. Foa BAL'ANCING DRUMS, ac. APPLICATION FILED NOV. 22,1911.

PatentedSept; 17,1918.

111:11 MMIIIMIHHHHHH 15 WITNESSE v v/ y f 'r FFIC HARVEYJOHN GEBR, OF WAYNESBORO, PENNSYLVANIA.

DEVICE FOR BALANCING DRUMS, &c.

I To all rwhom z may concern.'

Be it lmown that I, HARVEY JOHN GEHR, a citizen/ of the United States, residing at Waynesboro, State of -Pennslyvania, have invented a new and useful Device for Balancing Drums, &c., of which the following is a specification.

This invention has reference to devices for balancing machine elements such as drums and the like, whereby the drums may be quickly and accurately balanced to prevent undue strain upon the parts carrying them, especially when the drums are drlven at high speed.

In accordance with the invention, there is provided an upright shaft capable of being driven at high speed. At the upper end of the shaft there is provided a loose sleeve closed at one end and supported by the shaft in such manner that the sleeve is pendulously carried with a capability lof swing of very limited extent. The sleeve is arranged so as to carry the drum to be balanced, and associated with the drum is a marker so constructed thatvwith what constitutes the upper surface of the drum rotating at relatively slow speed, the position of the marker may be ascertained, -and then by highly increasing the speed of the drum another reading of the marker may be taken showing any oscillation of the drum about lts axis of rotation.. Should oscillation occur, the marker may be made to produce an indication on the drum at 'the high side thereof, and a reading may be taken of the .position of the marker at such time so that not only isthe high side ofthe drum indicated, but the amount of oscillation is measured. By such means, an o erator is guided in adjusting the balance o the drum until such drum will rotate at high speed without oscillation. I Y

-The invention will be best understood from a consideration of the following detailed description, taken in connection with drawings forming part of this specificatlon, with the further understanding that, while the drawings show' a practical form of the invention, the latter is not confined to any strict conformity with the showing of the drawings but may be changed and modified so long as such Specication of Letters Patent.

Application led November 22, 1917. Serial N o. 23,388.

1n the county of Franklin and Patented Sept. 17, 1918.

changes and modifications come withinthe scope ofthe appended claims.

In the drawings:

Figure 1v is an elevation of an embodiment of the 'placeg Fig. 2 is a longitudinal diametric section of a portion of the drum-carrying shaft'and vvof the shaft-carried sleeve on which the drum is secured; x

Fig. 3 is a 'section .oi the sleeve on the line 3-3 of Fig. 2, the shaft and; key being shown in plan;

Fig. 4 is a top plan view ofthe shaft.

Referring to the drawings,'there is shown a shaft 1 mounted in bearingsZ upon supports 3.4 The shaft, in operation, is upright and is adjusted as carefully as may beto rotate about a vertical axis. A collar 4 resting on the lower bearing 2 serves to support the shaft, although any kind of a step bearing suitable for the purpose may be employed. The vshaft carries a pulley 5 forming a convenient means for the application of a belt to drive the shaft. The pulley 5 is to be taken as indicative of any suitable means for driving the shaft.

Since, in operation, the shaft is upright, terms of position as hereinafter used will have reference to the working position of the shaft.

The upper end'6 of the shaft is rounded or approximately semi-spherical, and has a diametric groove 7 formed at its apex.

Mounted on the upper end of thel shaft l is a sleeve 8 having an axially extended chamber 9 terminating near the top of the sleevein a rounded end wall-10 of approximately semi-spherical shape 4and described on a longer rad-ius than the end 6 of the shaft. Above the chamber 9 the sleeve 8 has a soli extension 11. v The sleeve 8 has an external diameter to snugly lfit the bore of a drum 12 to be balanced, s aid drum having the usual hubs 13 through which are tapped set screws -14 utilized for fastening the drum securely to the sleeve 8. A set collar 15 held to the sleeve 8.by a set screw 16 serves as a support for the drum determining the height invention`showing 'a drum in.

ioo

screws 14 are screwed home.

of it is seated in The sleeve 8 is constrained to rotate with the shaft 1 by a pinor key 17 traversing the sleeve in such position that one portion the'solid member 11 ofthe sleeve 8 and another portion enters the groove 7. The pin or ke 17 forms a connectionbetween the sha tand the sleeve, but need not seat tov the bottom of the groove, and does not tightly it the groove so that there is opportunity for the sleeve 8 to rock on the shaft, such rocking being facilitated by the convex end of the shaft seating in the concave end of after the manner of a somewhat loose universal joint. Pivoted at one end to ai convenient support 18 is an arm 19 overlying the shaft 1 andV at the end remote from provided with a handle 20. The arm 19 moves' overa scale 21 and may be provided with a slot 22 through which the scale is readable. Of course, any other arrangement whereby the relation of the arm to the scale is made evident may be employed. Mounted on the arm 19 is a marking implement 23, such, for instance, as a pencil, so arranged that themarking. end of the pencil may be brought into contact with the upper end of the surface of the drum 12, the arm 19` with'the pencil 23 being under the control of anoperator.

The drum 12 having been properly iinished, especially with respect to what conkey stitutes its upper surface when on the shaft- 1, to rotate in a horizontal plane when ,the shaft 1 is upright 'or plumb, and with the lower hub 13 resting on the collar 15 and the or pin 17 engaging in drum may equilibrium.

be considered as' in a state of Under these conditions, the

g drum and the sleeve 11 are pendantly sup# upper end of the.

ported by the shaft 1, the drum bein so seated on the sleeve that lthe location o the shaft with respect tothe chamber 9 of the sleeve 11 l v drum.. Now, by rotatingthe shaft 1 slowly and bringing,the

concave end of the pencil 23 into light contact with the upper surface of the drum, a -mark will be produced on the drum entirely around the upper surface of the drum, care being taken to avoid such pressure drum out of adjustment. Note is taken of the position of the arm 19 on the scale 21, and then the drum is rotated at a very high rate of speed, thepencil '23 having in the meantimebeen moved out of contact with the drum. Now, if there be inaccuracies of balance in the drum,V it will no lon'ger remain truly lohorizontal, but will rock orl swing.

' Then if the pencil-23 be again brought into vand note be takenn of the light contact with the drum, which contact caribe very delicately ascertained by feel, position of the arinl 19 with respect to the scale'21, the mark the chamber .9

the support 18 the groove 7 the as would throw the sociated with the spindle and produced by the pencil will extend through a small arc on the face of the drum. This indicates atwhat point the drum is out of' the operation is repeatedv if necessary until g the drum is put in running balance.

The structure of the invention is one of great delicacy with respect to the putting'of the drum into vtended to be used where a high degree of refinement is essential. More pronounced inaccuracies of balance may be ascertain by other and simpler means, but such means do' not indicate the small inaccuracies in balance which are'multiplied and become more .pronounced when the drum is -rotated at hi h speed.

he utilization ofthe sense of touch is of importance, 'and' this permitsl the touching of the pencil to the high side of the drum when out of balance and tilted by the high speed of rotation, since the pencil may be made to touch the drum so gently that equilibrium will'mot'be disturbed, for otherwise the mark recorded on thedrum would not #truthfully indicate the location of the inaccuracy in balance.

While the invention is not limited to the balancin of drums,the term drum is used in the c aims for simplicity of expression and is to be interpreted aslbroad enough in scope to cover any structure to be put into running balance, `for .which structure the device of the invention is adapted.-

What is claimed-is: l

A 1. A device for ing an. upright rotatable shaft, a sleeve -loosely supported by and vrotatable with the shaft and capable of rocking'with respect to the laxis of rotation .of `the shaft, said sleeve being of a size and marking and indicating means for loto receive and hold a drum,l

running balance, and is ineeVeov balancing drums compriseating the part of the drum out ofbalance and the degree-thereof. Q

2. A device for determining the degree of out of balance in drums preparatory to balancingthe drums, comprising an uprightV druml and sleevecombined when the latter and means assleeve for vinof tilt. of the drum and rotating 'at high is rotating onan upright axis,

dicating the amount when out o f'balance speed, and also. the high point of the tilted rotating drum. f

.3. A device'for determining the degree of out of'balance in drums preparatory to balancing the drums, comprising an upright rosleeve carried thereby to. mark a" drum tatablef shaft or spindle, an upright. sleeve -pendulously carried by the spindle for receiving and supporting the drum to be balanced, and hand operatedmeans for marking the drum and indicating the degree of out of balance.

l4. A device for'determining the degree of outl of balance in drums preparatory to balancing the drums, comprising a rotatable upright shaft or spindle having a convex up.- per end with a transverse groove therein, a sleeve closed at the upper end and having an interior diameter greater than the diameter of the spindle to .permit the sleeve to rock on the spindle said sleeve having an interior concave wall at the closed end, a connecting .pin loosely fitting the transverse groove in the upper end of the shaft or spindle, and marln'ng means for hand operation associated with the shaft or spindle and mounted on the sleeve and rotated thereby and to indicate the degree of out'of balance of the drum. f v

5. A device for determining the degree of out of balance in drums preparatory to balancing the drums, comprising a rotatable I upright shaft or spindle havlng a convex eter of the spindle to permit the sleeve to*A rock on the spindle said sleeve having 'an interior concave wall at the closed end, a connecting pin, loosely fitting the transverse groove in the upper end of the shaft or spindle, and marking means for hand operat1on associated with the shaft or spindle and sleeve carried thereby to mark a drum mounted on the sleeve and rotated thereby and to indicate the degree of out of balance of the drum, said hand operated marking means comprising an arm pivotally supported at one end and arranged to be grasped by the hand at the other end, a scale associated with the arm, and means forl hold-1` ing a marking implement in position to contact with the drum while being rotated.

In testimony that I claim the foregoing as my own I have hereto aiiixed my signature. in the presenceof two witnesses.

i HARVEY JOHN GEHR.

Witnesses:

ROY E. FRIEDLY, JOHN A. Poma. 

